* Add limited checkstyles to test code
Add a limited set of checkstyle rules to the test codebase to improve
code consistency.
* Fix checksyle violations in test code
* Organize imports to fix checkstyle for test code
* Migrate to assertThatExceptionOfType
Migrate aware from ExpectedException rules to AssertJ exception
assertions. Also include a checkstyle rules to ensure that the
the ExpectedException is not accidentally used in the future.
See gh-22894
d7320de871